feat: readiness check (#1839)

* feat: readiness check

* fix: no need for query param

* docs: add a note

* chore: move the readyness check to its own endpoint

* docs(cr): add godoc

Co-authored-by: Joel Speed <Joel.speed@hotmail.co.uk>

pkg/apis/sessions/interfaces.go

@@ -12,6 +12,7 @@ type SessionStore interface {
 	Save(rw http.ResponseWriter, req *http.Request, s *SessionState) error
 	Load(req *http.Request) (*SessionState, error)
 	Clear(rw http.ResponseWriter, req *http.Request) error
+	VerifyConnection(ctx context.Context) error
 }
 
 var ErrLockNotObtained = errors.New("lock: not obtained")